Automatic Welding, 2024, №03



2024 №03 (01)

DOI of Article 10.37434/as2024.03.02

2024 №03 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #4, 2024, pp. 11-18

Mechanical properties of the reaction-diffusion bonding of the heat-resistant nickel-based CHS70VI alloy

V.E. Mazurak, M.O. Cherviakov, T.M. Kushnaryova, I.R. Volosatov

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The joint of the heat-resistant nickel-based ChS70VI alloy, produced by the method of reaction-diffusion bonding during the formation of a weld by the melt of the heat-resistant nickel alloy with zirconium as a depressant, was considered. The microstructures and distribution of concentrations of all chemical elements through the joint zone with the areas across the weld (with a gap width of ~20 and 50μm) after the weld formation and the subsequent heat treatment were analyzed. It is shown that the selected mode of heat treatment provides a significant reduction in the amount of zirconium-rich eutectic phases (they are more easily melted, with a melting point of 960 °С), which improves the heat resistance of the joint. During heat treatment, the diffusion process of the weld occurs, and the concentration of chemical elements in the weld approximate to corresponding concentrations in the base alloy. Mechanical tests showed sufficiently high strength properties of the joint at temperatures up to 1100°C. It was established that at the test temperature of 750°С, the strength of the joint is at the level of 95-98% of the ultimate strength of the base alloy.
Keywords: heat-resistant nickel alloys; microstructure; mechanical properties; reaction-diffusion bonding; ChS70-VI alloy; contact-reactive fusion; transient liquid phase bonding

Received: 01.11.2023
Received in revised form: 03.05.2024
Accepted: 27.05.2024

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